I finally managed to get the automatic transmission out of my 1990 BMW E30 by bench pressing it off. I would not recommend you do this unless you know what you are doing!
Part 1:
https://steemit.com/blog/@motoengineer/blog-mechanical-bmw-e30-transmission-swap.
Part 2:
https://steemit.com/blog/@motoengineer/tech-blog-bmw-e30-swapping-a-manual-transmission-part-2
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